Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field
Pedersen, Jonas LU ; Bohr, Dan ; Wacker, Andreas LU
; Novotny, Tomas
; Schmitteckert, Peter
and Flensberg, Karsten
(2009)
In Physical Review B
79.
- Abstract
- We study the competition between interference due to multiple single-particle paths and Coulomb interaction in a simple model of an Anderson-type impurity with local-magnetic-field-induced level splitting coupled to ferromagnetic leads. The model along with its potential experimental relevance in the field of spintronics serves as a nontrivial benchmark system where various quantum-transport approaches can be tested and compared. We present results for the linear conductance obtained by a spin-dependent implementation of the density-matrix renormalization-group scheme which are compared with a mean-field solution as well as a seemingly more advanced Hubbard-I approximation. We explain why mean field yields nearly perfect results while the... (More)
- We study the competition between interference due to multiple single-particle paths and Coulomb interaction in a simple model of an Anderson-type impurity with local-magnetic-field-induced level splitting coupled to ferromagnetic leads. The model along with its potential experimental relevance in the field of spintronics serves as a nontrivial benchmark system where various quantum-transport approaches can be tested and compared. We present results for the linear conductance obtained by a spin-dependent implementation of the density-matrix renormalization-group scheme which are compared with a mean-field solution as well as a seemingly more advanced Hubbard-I approximation. We explain why mean field yields nearly perfect results while the more sophisticated Hubbard-I approach fails even at a purely conceptual level since it breaks hermiticity of the related density matrix. Furthermore, we study finite bias transport through the impurity by the mean-field approach and recently developed higher-order density-matrix equations. We found that the mean-field solution fails to describe the plausible results of the higher-order density-matrix approach both quantitatively and qualitatively, as it does not capture some essential features of the current-voltage characteristics such as negative differential conductance. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1268473
- author
- Pedersen, Jonas
LU
; Bohr, Dan
; Wacker, Andreas
LU
; Novotny, Tomas
; Schmitteckert, Peter
and Flensberg, Karsten
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 79
- article number
- 125403
- publisher
- American Physical Society
- external identifiers
-
- wos:000264769300084
- scopus:63149113416
- ISSN
- 1550-235X
- DOI
- 10.1103/PhysRevB.79.125403
- language
- English
- LU publication?
- yes
- id
- 96bf003d-9fd0-45f5-bd03-9904b8963fe5 (old id 1268473)
- date added to LUP
- 2016-04-04 10:49:00
- date last changed
- 2022-01-29 20:53:09
@article{96bf003d-9fd0-45f5-bd03-9904b8963fe5,
abstract = {{We study the competition between interference due to multiple single-particle paths and Coulomb interaction in a simple model of an Anderson-type impurity with local-magnetic-field-induced level splitting coupled to ferromagnetic leads. The model along with its potential experimental relevance in the field of spintronics serves as a nontrivial benchmark system where various quantum-transport approaches can be tested and compared. We present results for the linear conductance obtained by a spin-dependent implementation of the density-matrix renormalization-group scheme which are compared with a mean-field solution as well as a seemingly more advanced Hubbard-I approximation. We explain why mean field yields nearly perfect results while the more sophisticated Hubbard-I approach fails even at a purely conceptual level since it breaks hermiticity of the related density matrix. Furthermore, we study finite bias transport through the impurity by the mean-field approach and recently developed higher-order density-matrix equations. We found that the mean-field solution fails to describe the plausible results of the higher-order density-matrix approach both quantitatively and qualitatively, as it does not capture some essential features of the current-voltage characteristics such as negative differential conductance.}},
author = {{Pedersen, Jonas and Bohr, Dan and Wacker, Andreas and Novotny, Tomas and Schmitteckert, Peter and Flensberg, Karsten}},
issn = {{1550-235X}},
language = {{eng}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field}},
url = {{https://lup.lub.lu.se/search/files/5627784/1268478.pdf}},
doi = {{10.1103/PhysRevB.79.125403}},
volume = {{79}},
year = {{2009}},
}